Combine webrtc/api/java/android and webrtc/api/java/src.

It used to be that there was a Java api for devices not running Android
but that is no longer the case. I combined the directories and made
the folder structure chromium style.

BUG=webrtc:6067
R=magjed@webrtc.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/2111823002 .

Cr-Commit-Position: refs/heads/master@{#13356}
diff --git a/webrtc/api/api.gyp b/webrtc/api/api.gyp
index 3ab0bf9..eb8c9c0 100644
--- a/webrtc/api/api.gyp
+++ b/webrtc/api/api.gyp
@@ -35,27 +35,27 @@
             'libjingle_peerconnection',
           ],
           'sources': [
+            'android/jni/androidmediacodeccommon.h',
+            'android/jni/androidmediadecoder_jni.cc',
+            'android/jni/androidmediadecoder_jni.h',
+            'android/jni/androidmediaencoder_jni.cc',
+            'android/jni/androidmediaencoder_jni.h',
+            'android/jni/androidmetrics_jni.cc',
+            'android/jni/androidnetworkmonitor_jni.cc',
+            'android/jni/androidnetworkmonitor_jni.h',
+            'android/jni/androidvideocapturer_jni.cc',
+            'android/jni/androidvideocapturer_jni.h',
+            'android/jni/classreferenceholder.cc',
+            'android/jni/classreferenceholder.h',
+            'android/jni/jni_helpers.cc',
+            'android/jni/jni_helpers.h',
+            'android/jni/native_handle_impl.cc',
+            'android/jni/native_handle_impl.h',
+            'android/jni/peerconnection_jni.cc',
+            'android/jni/surfacetexturehelper_jni.cc',
+            'android/jni/surfacetexturehelper_jni.h',
             'androidvideocapturer.cc',
             'androidvideocapturer.h',
-            'java/jni/androidmediacodeccommon.h',
-            'java/jni/androidmediadecoder_jni.cc',
-            'java/jni/androidmediadecoder_jni.h',
-            'java/jni/androidmediaencoder_jni.cc',
-            'java/jni/androidmediaencoder_jni.h',
-            'java/jni/androidmetrics_jni.cc',
-            'java/jni/androidnetworkmonitor_jni.cc',
-            'java/jni/androidnetworkmonitor_jni.h',
-            'java/jni/androidvideocapturer_jni.cc',
-            'java/jni/androidvideocapturer_jni.h',
-            'java/jni/surfacetexturehelper_jni.cc',
-            'java/jni/surfacetexturehelper_jni.h',
-            'java/jni/classreferenceholder.cc',
-            'java/jni/classreferenceholder.h',
-            'java/jni/jni_helpers.cc',
-            'java/jni/jni_helpers.h',
-            'java/jni/native_handle_impl.cc',
-            'java/jni/native_handle_impl.h',
-            'java/jni/peerconnection_jni.cc',
           ],
           'include_dirs': [
             '<(libyuv_dir)/include',
@@ -83,7 +83,7 @@
             'libjingle_peerconnection_jni',
           ],
           'sources': [
-           'java/jni/jni_onload.cc',
+           'android/jni/jni_onload.cc',
           ],
           'variables': {
             # This library uses native JNI exports; tell GYP so that the